Veins have valves because

The splitting of a beam of white light into the colours which make it up is called:

Which of the following social issues are associated with the use of illegal drugs by adolescents?

1. Criminal activity
2. Indiscipline
3. Early marriage
4. Poverty

Choose the ONE underlined part A, B or C that is inappropriate. If the sentence is acceptable as it stands, choose D.

June prefers to lie in bed not wanting to go to school nor does any work.

The interest rate on investments in a bank decreased from 8 ¹/₂ per cent per annum to 6 per cent per annum. The difference in annual interest on a deposit of $2 000 is

The two main protein groups are globular and:

The units we use for heat given out by a reaction are:

A dynamo connected to a circuit is being turned.Which one of the following would NOT generate a greater e.m.f.?

If x = 3² × 2³, then x⁴ =

All of the following have endoskeletons EXCEPT for:

The Haber Process is used to make:

The number of double bonds in a molecule of carbon dioxide is:

In metals, the particles forming the structure are all:

A detector close to a sample of radioactive material records 76 counts per second (cps). Precisely 2 days later the count rate has fallen to 22 cps.The count rate due to background radiation, taken immediately before and after the experiment, averaged 4 cps. The half-life of the material is:

To work out the heat change in a reaction we need to know just three things, the mass, the temperature change and the:

A business operates its petty cash on the imprest system. At the beginning of the month the petty cashier was given $20.00 out of which she spent $15.20. How much will she be reimbursed?

Plant stems grow towards a light source.This is an example of:

The marked price of a bicycle was $260. A man bought the bicycle on hire-purchase by making a down payment of $100, and twelve monthly payments of $16 each. How much could he have saved if he had bought the bicycle for the marked price?

Tooth decay can be caused by: